Welcome to the Forum. I'll be glad to comment but the decision to take PEP is a personal one.  I hope the information i provide will be helpful to you.

FYI, medications, including crystal are likely to be well absorbed through the rectum.  This is relevant to your situations since, had he been successful in inserting the syringe into your rectum, I suspect you would have experienced the effects of the drug, which you did not.  Thus it is reasonable to assume that the syringe he was using did not go into your rectum and therefore even if contaminated with his secretions, it is unlikely that you were exposed.  I would add that you do not know this person's HIV status so he may not have been infected.  

Bottom line, I suspect this was a very low risk event and had I been in a similar situation, I probably would not have sought PEP.  You did and now, almost three weeks after your exposure, I see no reason not to finish your medication course.  I emphasize however that the choice about PEP is a personal one and as long as you are tolerating the medication well, there is little reason not to finish the course.

I hope this perspective is helpful to you. EWH

I understand your concerns. After all, essentially you were sexually assaulted by someone who wanted to drug you without your knowing.  At he same time however, your risk of having been exposed to HIV through these activities is very, very low and, as i have already told you, is not something I would worry about. Thus to repeat and empahasize what I have already said:

1.  I do agree with the others who said this was a virtually no risk event (said this before)

2.  HIV becomes non-infectious almost immediately once it is outside the body.

3.  No, I have never heard of anyone getting infected in the way you have described.  

EWH

I presume that in sentence two you meant to write "4 weeks" rather than "4 days".  Irrespective, my reply is that after 4 weeks a 4th generation, combination HIV antigen/antibody test will provide accurate information regarding whether or not you were infected by the events we are discussing.  I would cover these results definitive and have never seen or heard of someone's follow-up test taking more than 4 weeks to become positive after completion of PEP.  I should acknowledge however that there are some groups including the CDC which state that while 4 week results are highly reliable, a second follow-up test should be done at 3 months. I find these recommendations for a second test overly conservative which is a characteristic of the CDC but I would not be doing my job if I did not provide this information to you.  Were I you, a negative 4 week test would be all that I would do.

I hope these replies have been helpful.  As this is my 3rd response, this completes this thread which will be closed shortly.  Take care and please don't worry, the encounter you describe was very, very low risk.  EWH